Alert only for certificates issued from a set of trusted roots

go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/sendgrid/sendgrid-go v3.16.0+incompatible
 	github.com/sigstore/rekor v1.3.9
 	github.com/sigstore/sigstore v1.8.12
+	github.com/sigstore/sigstore-go v0.7.0
 	github.com/transparency-dev/merkle v0.0.2
 	github.com/wneessen/go-mail v0.6.1
 	golang.org/x/mod v0.22.0
@@ -31,6 +32,8 @@ require (
 	github.com/common-nighthawk/go-figure v0.0.0-20210622060536-734e95fb86be // indirect
 	github.com/cyberphone/json-canonicalization v0.0.0-20220623050100-57a0ce2678a7 // indirect
 	github.com/danieljoos/wincred v1.2.0 // indirect
+	github.com/digitorus/pkcs7 v0.0.0-20230818184609-3a137a874352 // indirect
+	github.com/digitorus/timestamp v0.0.0-20231217203849-220c5c2851b7 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/fxamacker/cbor/v2 v2.5.0 // indirect
 	github.com/go-chi/chi v4.1.2+incompatible // indirect
@@ -82,6 +85,8 @@ require (
 	github.com/secure-systems-lab/go-securesystemslib v0.9.0 // indirect
 	github.com/sendgrid/rest v2.6.9+incompatible // indirect
 	github.com/shibumi/go-pathspec v1.3.0 // indirect
+	github.com/sigstore/protobuf-specs v0.3.3 // indirect
+	github.com/sigstore/timestamp-authority v1.2.4 // indirect
 	github.com/sourcegraph/conc v0.3.0 // indirect
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/spf13/cast v1.7.0 // indirect
@@ -90,6 +95,7 @@ require (
 	github.com/spf13/viper v1.19.0 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
 	github.com/theupdateframework/go-tuf v0.7.0 // indirect
+	github.com/theupdateframework/go-tuf/v2 v2.0.2 // indirect
 	github.com/titanous/rocacheck v0.0.0-20171023193734-afe73141d399 // indirect
 	github.com/ulikunitz/xz v0.5.12 // indirect
 	github.com/veraison/go-cose v1.3.0 // indirect
@@ -109,6 +115,7 @@ require (
 	golang.org/x/term v0.28.0 // indirect
 	golang.org/x/text v0.21.0 // indirect
 	golang.org/x/time v0.9.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20241209162323-e6fa225c2576 // indirect
 	google.golang.org/protobuf v1.36.4 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

go.sum

@@ -90,6 +90,11 @@ github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/digitorus/pkcs7 v0.0.0-20230713084857-e76b763bdc49/go.mod h1:SKVExuS+vpu2l9IoOc0RwqE7NYnb0JlcFHFnEJkVDzc=
+github.com/digitorus/pkcs7 v0.0.0-20230818184609-3a137a874352 h1:ge14PCmCvPjpMQMIAH7uKg0lrtNSOdpYsRXlwk3QbaE=
+github.com/digitorus/pkcs7 v0.0.0-20230818184609-3a137a874352/go.mod h1:SKVExuS+vpu2l9IoOc0RwqE7NYnb0JlcFHFnEJkVDzc=
+github.com/digitorus/timestamp v0.0.0-20231217203849-220c5c2851b7 h1:lxmTCgmHE1GUYL7P0MlNa00M67axePTq+9nBSGddR8I=
+github.com/digitorus/timestamp v0.0.0-20231217203849-220c5c2851b7/go.mod h1:GvWntX9qiTlOud0WkQ6ewFm0LPy5JUR1Xo0Ngbd1w6Y=
 github.com/fatih/color v1.16.0 h1:zmkK9Ngbjj+K0yRhTVONQh1p/HknKYSlNT+vZCzyokM=
 github.com/fatih/color v1.16.0/go.mod h1:fL2Sau1YI5c0pdGEVCbKQbLXB6edEj1ZgiY4NijnWvE=
 github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
@@ -139,6 +144,8 @@ github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=
 github.com/godbus/dbus/v5 v5.1.0/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/golang-jwt/jwt/v5 v5.2.1 h1:OuVbFODueb089Lh128TAcimifWaLhJwVflnrgM17wHk=
 github.com/golang-jwt/jwt/v5 v5.2.1/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
+github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 github.com/google/certificate-transparency-go v1.3.1 h1:akbcTfQg0iZlANZLn0L9xOeWtyCIdeoYhKrqi5iH3Go=
 github.com/google/certificate-transparency-go v1.3.1/go.mod h1:gg+UQlx6caKEDQ9EElFOujyxEQEfOiQzAt6782Bvi8k=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
@@ -160,6 +167,8 @@ github.com/google/rpmpack v0.6.0 h1:LoQuqlw6kHRwg25n3M0xtYrW+z2pTkR0ae1xx11hRw8=
 github.com/google/rpmpack v0.6.0/go.mod h1:uqVAUVQLq8UY2hCDfmJ/+rtO3aw7qyhc90rCVEabEfI=
 github.com/google/s2a-go v0.1.9 h1:LGD7gtMgezd8a/Xak7mEWL0PjoTQFvpRudN895yqKW0=
 github.com/google/s2a-go v0.1.9/go.mod h1:YA0Ei2ZQL3acow2O62kdp9UlnvMmU7kA6Eutn0dXayM=
+github.com/google/tink/go v1.7.0 h1:6Eox8zONGebBFcCBqkVmt60LaWZa6xg1cl/DwAh/J1w=
+github.com/google/tink/go v1.7.0/go.mod h1:GAUOd+QE3pgj9q8VKIGTCP33c/B7eb4NhxLcgTJZStM=
 github.com/google/trillian v1.7.1 h1:+zX8jLM3524bAMPS+VxaDIDgsMv3/ty6DuLWerHXcek=
 github.com/google/trillian v1.7.1/go.mod h1:E1UMAHqpZCA8AQdrKdWmHmtUfSeiD0sDWD1cv00Xa+c=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
@@ -293,10 +302,14 @@ github.com/sendgrid/sendgrid-go v3.16.0+incompatible h1:i8eE6IMkiCy7vusSdacHHSBU
 github.com/sendgrid/sendgrid-go v3.16.0+incompatible/go.mod h1:QRQt+LX/NmgVEvmdRw0VT/QgUn499+iza2FnDca9fg8=
 github.com/shibumi/go-pathspec v1.3.0 h1:QUyMZhFo0Md5B8zV8x2tesohbb5kfbpTi9rBnKh5dkI=
 github.com/shibumi/go-pathspec v1.3.0/go.mod h1:Xutfslp817l2I1cZvgcfeMQJG5QnU2lh5tVaaMCl3jE=
+github.com/sigstore/protobuf-specs v0.3.3 h1:RMZQgXTD/pF7KW6b5NaRLYxFYZ/wzx44PQFXN2PEo5g=
+github.com/sigstore/protobuf-specs v0.3.3/go.mod h1:vIhZ6Uor1a38+wvRrKcqL2PtYNlgoIW9lhzYzkyy4EU=
 github.com/sigstore/rekor v1.3.9 h1:sUjRpKVh/hhgqGMs0t+TubgYsksArZ6poLEC3MsGAzU=
 github.com/sigstore/rekor v1.3.9/go.mod h1:xThNUhm6eNEmkJ/SiU/FVU7pLY2f380fSDZFsdDWlcM=
 github.com/sigstore/sigstore v1.8.12 h1:S8xMVZbE2z9ZBuQUEG737pxdLjnbOIcFi5v9UFfkJFc=
 github.com/sigstore/sigstore v1.8.12/go.mod h1:+PYQAa8rfw0QdPpBcT+Gl3egKD9c+TUgAlF12H3Nmjo=
+github.com/sigstore/sigstore-go v0.7.0 h1:bIGPc2IbnbxnzlqQcKlh1o96bxVJ4yRElpP1gHrOH48=
+github.com/sigstore/sigstore-go v0.7.0/go.mod h1:4RrCK+i+jhx7lyOG2Vgef0/kFLbKlDI1hrioUYvkxxA=
 github.com/sigstore/sigstore/pkg/signature/kms/aws v1.8.12 h1:EC3UmIaa7nV9sCgSpVevmvgvTYTkMqyrRbj5ojPp7tE=
 github.com/sigstore/sigstore/pkg/signature/kms/aws v1.8.12/go.mod h1:aw60vs3crnQdM/DYH+yF2P0MVKtItwAX34nuaMrY7Lk=
 github.com/sigstore/sigstore/pkg/signature/kms/azure v1.8.12 h1:FPpliDTywSy0woLHMAdmTSZ5IS/lVBZ0dY0I+2HmnSY=
@@ -305,6 +318,8 @@ github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.8.12 h1:kweBChR6M9FEvmxN3B
 github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.8.12/go.mod h1:6+d+A6oYt1W5OgtzgEVb21V7tAZ/C2Ihtzc5MNJbayY=
 github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.8.12 h1:jvY1B9bjP+tKzdKDyuq5K7O19CG2IKzGJNTy5tuL2Gs=
 github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.8.12/go.mod h1:2uEeOb8xE2RC6OvzxKux1wkS39Zv8gA27z92m49xUTc=
+github.com/sigstore/timestamp-authority v1.2.4 h1:RjXZxOWorEiem/uSr0pFHVtQpyzpcFxgugo5jVqm3mw=
+github.com/sigstore/timestamp-authority v1.2.4/go.mod h1:ExrbobKdEuwuBptZIiKp1IaVBRiUeKbiuSyZTO8Okik=
 github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
 github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
 github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9ySo=
@@ -335,6 +350,8 @@ github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8
 github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
 github.com/theupdateframework/go-tuf v0.7.0 h1:CqbQFrWo1ae3/I0UCblSbczevCCbS31Qvs5LdxRWqRI=
 github.com/theupdateframework/go-tuf v0.7.0/go.mod h1:uEB7WSY+7ZIugK6R1hiBMBjQftaFzn7ZCDJcp1tCUug=
+github.com/theupdateframework/go-tuf/v2 v2.0.2 h1:PyNnjV9BJNzN1ZE6BcWK+5JbF+if370jjzO84SS+Ebo=
+github.com/theupdateframework/go-tuf/v2 v2.0.2/go.mod h1:baB22nBHeHBCeuGZcIlctNq4P61PcOdyARlplg5xmLA=
 github.com/tink-crypto/tink-go-awskms/v2 v2.1.0 h1:N9UxlsOzu5mttdjhxkDLbzwtEecuXmlxZVo/ds7JKJI=
 github.com/tink-crypto/tink-go-awskms/v2 v2.1.0/go.mod h1:PxSp9GlOkKL9rlybW804uspnHuO9nbD98V/fDX4uSis=
 github.com/tink-crypto/tink-go-gcpkms/v2 v2.2.0 h1:3B9i6XBXNTRspfkTC0asN5W0K6GhOSgcujNiECNRNb0=

pkg/ct/consistency.go

@@ -22,7 +22,7 @@ import (
 	ct "github.com/google/certificate-transparency-go"
 	ctclient "github.com/google/certificate-transparency-go/client"
 	"github.com/sigstore/rekor-monitor/pkg/util/file"
-	"github.com/sigstore/sigstore/pkg/cryptoutils"
+	sigstore_tuf "github.com/sigstore/sigstore-go/pkg/tuf"
 	"github.com/transparency-dev/merkle/proof"
 	"github.com/transparency-dev/merkle/rfc6962"
 )
@@ -41,12 +41,21 @@ func verifyCertificateTransparencyConsistency(logInfoFile string, logClient *ctc
 	}
 
 	if logClient.Verifier == nil {
-		// TODO: this public key is currently hardcoded- should be fetched from TUF repository instead
-		pubKey, err := cryptoutils.UnmarshalPEMToPublicKey([]byte(ctfe2022PubKey))
 
+		client, err := sigstore_tuf.DefaultClient()
 		if err != nil {
-			return nil, fmt.Errorf("error loading public key: %v", err)
+			return nil, fmt.Errorf("error creating TUF client: %v", err)
 		}
+
+		if err := client.Refresh(); err != nil {
+			return nil, fmt.Errorf("error refreshing TUF metadata: %v", err)
+		}
+
+		pubKey, err := client.GetTarget("ctfe2022PubKey")
+		if err != nil {
+			return nil, fmt.Errorf("error fetching public key: %v", err)
+		}
+
 		logClient.Verifier = &ct.SignatureVerifier{
 			PubKey: pubKey,
 		}